You can build train lines with Roman slaves, soldiers, or paid labor. Gotta have a private security force if you don’t have a Legion’s backing. Capitalization can come from the Roman treasury, investors, or PLUNDER.
Your train tiles can just have normal routes, just put a picture of space in the background behind the tracks.
The cities can be various planets and stars that are visited during the series. Earth, Heavy Metal, La Metal, Great Andromeda, etc. Instead of mountains on the map, there is the big gap between the Milky way and Andromeda galaxies that is very expensive and far to cross. Private companies can be smaller operations that work within a particular solar system.
The story can be that this is about the beginnings of the Galaxy Railways. Before all the rail companies merged together, there were many competing ones. That’s not canon that I’ve heard, but AFAIK there is no canon about the beginnings of the railways.
FWIW I would totally play this. 2038 does asteroid mining within the solar system, which is obviously pretty different and more focused on staking claims etc. than laying track.
I remembered reading about some crazy Japanese train game and finally found it, but it’s crayon rails not 18xx.
"you can gain honor points in three different ways:
Building your network to connect to more towns, cities, and big cities
Destroying other people’s trains during missions
Successfully completing missions"
Anyway, the thing I’ve internalized is that the really interesting part of 18xx games is the system of shared incentives that fits so naturally into the framework of laying track and starting companies. Everything you do has significant implications for everyone else. The history is incidental (and games are often only historic in a very broad sense). This whole shared incentive thing applies to many train-themed games from Paris Connection on up.
Um, obviously you build Roman roads and conquer the provincial territories with Legions. A Legion is just a pointier train made of humans anyway. Roads are tracks. The Empire awaits.
Of course you should probably go with 180, since by 680 it was all Merovingia this and Merovingia that.
Sometimes you try things and they work out. Other days you dump a company and try to start two new ones, only to have the good one stolen from you, sending you down a spiral of increasingly desperate decisions until…